Ch2 - Atoms and Molecules The Chemical Basis of Life...

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Atoms and Molecules: The Chemical Basis of Life Chapter 2
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Element Functions Carbon backbone of organic molecules Hydrogen and oxygen components of water Nitrogen component of proteins and nucleic acids
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Atom An atom is defined as the smallest portion of an element that retains its chemical properties Nucleus Electrons In an electrically neutral atom: ?
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Atomic Number and Mass Atomic number of an atom is the number of protons in that atom Its atomic mass is: sum of protons and neutrons
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AMU Atomic Mass Unit Mass of a single proton or neutron Mass of an electron An element is a substance that consists of only one type of atom
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Fig 2-2: Isotopes Unstable Unstable isotopes break down (decay) to stable isotopes:
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Autoradiography of 3 H – thymidine uptake into DNA in Drosophila chromosomes Fig 2-3 Autoradiography
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Orbitals Electrons move rapidly in electron orbitals Electron shell
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Valence Electrons Electron in the outer shell Number and arrangement of an atom’s valence (highest energy) electrons determines its chemical properties
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This note was uploaded on 09/25/2010 for the course BIOLOGY Biology 10 taught by Professor D'arville during the Spring '10 term at Rutgers.

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Ch2 - Atoms and Molecules The Chemical Basis of Life...

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